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After a very cold start to January, the pond had a thick layer of ice on it. I can't really say how thick it was (at least 6"/15cm), but it lasted for most of the month. It thawed a bit once and got over an inch of rain on it, then another cold snap froze that.

By the last day of the month though, most of the ice was gone and I was able to take a good look.

***

Right away I noticed something weird (not the bamboo culm -- I have no idea how that got into the water)...

It was these little floating clumps of... I didn't know what. Something that fell from the trees? A kind of dirt? Some remnant of the ice?

The stuff was everywhere:

Half of the pond was still covered by ice...

...but the part that wasn't had these clumps of "stuff"on it. Hmmm.

I finally put down the camera (love those winter tree reflections!) and satisfied my curiosity:

Bugs! Tiny insects!

But wait... some research (several attempted Google searches, the key was including the word "winter") finally revealed that these are springtails (in the order Collembola). Some species of springtails are aquatic (check!) and are primarily active in very cold weather (check!).